Figure 15.

Schematic Model of the S-Type Anion Channel- and K⁺_in Channel-Mediated Regulatory Network for Stomatal Movement.

Drought stress triggers the production of ABA, which in turn triggers three signaling branches, including the upregulation of SLAC1, the activation of anion channels SLAC1 and SLAH3, and the inhibition of K⁺_in channels KAT1 and AKT2 and stomatal opening. SLAC1 and SLAH3 play dual roles of mediating anion efflux and inhibiting K⁺_in currents. Arrows and T-bars represent positive and negative regulation, respectively.